Swpd and Free Memory [duplicate]
2
This question already has an answer here:
Why is swap being used even though I have plenty of free RAM?
6 answers
I'm tryng to stress a web server with requests, I used vmstat to get the memory usage of the server, but I don't understand few things.
- When the requests start, the free memory decreases and the swpd increases, but after a while, even if the requests continue at the same rate, the free memory goes up. I think it's because the system goes out of free memory, or at least to avoid that before it's to late, allocates new memory with swap memory, am I right?
- Is there a way to limit the swap memory allocation?
server ram swap
edited Feb 2 at 16:56
Mr Shunz
2,49121922
asked Feb 2 at 16:51
simone biancosimone bianco
132
marked as duplicate by Fabby, karel, Charles Green, Eric Carvalho, user68186 Feb 6 at 15:42
This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.
add a comment |
2
This question already has an answer here:
Why is swap being used even though I have plenty of free RAM?
6 answers
I'm tryng to stress a web server with requests, I used vmstat to get the memory usage of the server, but I don't understand few things.
- When the requests start, the free memory decreases and the swpd increases, but after a while, even if the requests continue at the same rate, the free memory goes up. I think it's because the system goes out of free memory, or at least to avoid that before it's to late, allocates new memory with swap memory, am I right?
- Is there a way to limit the swap memory allocation?
server ram swap
edited Feb 2 at 16:56
Mr Shunz
2,49121922
asked Feb 2 at 16:51
simone biancosimone bianco
132
marked as duplicate by Fabby, karel, Charles Green, Eric Carvalho, user68186 Feb 6 at 15:42
This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.
1) Could you add the graph for mem used by application too ? 2) Why do you want to reduce swap allocation ? Do you have bad performance ?
– Soren A
Feb 2 at 16:57
1) Unfortunately no 2) I want to test the performances without the swap memory
– simone bianco
Feb 2 at 17:01
As long as you have free memory swap doesn't impact performance in any way. But if you wan't, you can disable swap bu runningsudo swapoff -a
– Soren A
Feb 2 at 17:07
Perfect thanks. Also is there a way to set a specific dimension, same for buffer?
– simone bianco
Feb 2 at 17:52
add a comment |
2
2
2
This question already has an answer here:
Why is swap being used even though I have plenty of free RAM?
6 answers
I'm tryng to stress a web server with requests, I used vmstat to get the memory usage of the server, but I don't understand few things.
- When the requests start, the free memory decreases and the swpd increases, but after a while, even if the requests continue at the same rate, the free memory goes up. I think it's because the system goes out of free memory, or at least to avoid that before it's to late, allocates new memory with swap memory, am I right?
- Is there a way to limit the swap memory allocation?
server ram swap
edited Feb 2 at 16:56
Mr Shunz
2,49121922
asked Feb 2 at 16:51
simone biancosimone bianco
132
This question already has an answer here:
Why is swap being used even though I have plenty of free RAM?
6 answers
I'm tryng to stress a web server with requests, I used vmstat to get the memory usage of the server, but I don't understand few things.
- When the requests start, the free memory decreases and the swpd increases, but after a while, even if the requests continue at the same rate, the free memory goes up. I think it's because the system goes out of free memory, or at least to avoid that before it's to late, allocates new memory with swap memory, am I right?
- Is there a way to limit the swap memory allocation?
This question already has an answer here:
Why is swap being used even though I have plenty of free RAM?
6 answers
server ram swap
server ram swap
edited Feb 2 at 16:56
Mr Shunz
2,49121922
asked Feb 2 at 16:51
simone biancosimone bianco
132
edited Feb 2 at 16:56
Mr Shunz
2,49121922
asked Feb 2 at 16:51
simone biancosimone bianco
132
edited Feb 2 at 16:56
Mr Shunz
2,49121922
edited Feb 2 at 16:56
Mr Shunz
2,49121922
edited Feb 2 at 16:56
Mr Shunz
2,49121922
2,49121922
asked Feb 2 at 16:51
simone biancosimone bianco
132
asked Feb 2 at 16:51
simone biancosimone bianco
132
asked Feb 2 at 16:51
simone biancosimone bianco
132
132
marked as duplicate by Fabby, karel, Charles Green, Eric Carvalho, user68186 Feb 6 at 15:42
This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.
marked as duplicate by Fabby, karel, Charles Green, Eric Carvalho, user68186 Feb 6 at 15:42
This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.
1) Could you add the graph for mem used by application too ? 2) Why do you want to reduce swap allocation ? Do you have bad performance ?
– Soren A
Feb 2 at 16:57
1) Unfortunately no 2) I want to test the performances without the swap memory
– simone bianco
Feb 2 at 17:01
As long as you have free memory swap doesn't impact performance in any way. But if you wan't, you can disable swap bu runningsudo swapoff -a
– Soren A
Feb 2 at 17:07
Perfect thanks. Also is there a way to set a specific dimension, same for buffer?
– simone bianco
Feb 2 at 17:52
add a comment |
1) Could you add the graph for mem used by application too ? 2) Why do you want to reduce swap allocation ? Do you have bad performance ?
– Soren A
Feb 2 at 16:57
1) Unfortunately no 2) I want to test the performances without the swap memory
– simone bianco
Feb 2 at 17:01
As long as you have free memory swap doesn't impact performance in any way. But if you wan't, you can disable swap bu runningsudo swapoff -a
– Soren A
Feb 2 at 17:07
Perfect thanks. Also is there a way to set a specific dimension, same for buffer?
– simone bianco
Feb 2 at 17:52
1) Could you add the graph for mem used by application too ? 2) Why do you want to reduce swap allocation ? Do you have bad performance ?
– Soren A
Feb 2 at 16:57
1) Could you add the graph for mem used by application too ? 2) Why do you want to reduce swap allocation ? Do you have bad performance ?
– Soren A
Feb 2 at 16:57
1) Unfortunately no 2) I want to test the performances without the swap memory
– simone bianco
Feb 2 at 17:01
1) Unfortunately no 2) I want to test the performances without the swap memory
– simone bianco
Feb 2 at 17:01
As long as you have free memory swap doesn't impact performance in any way. But if you wan't, you can disable swap bu running
sudo swapoff -a– Soren A
Feb 2 at 17:07
As long as you have free memory swap doesn't impact performance in any way. But if you wan't, you can disable swap bu running
sudo swapoff -a– Soren A
Feb 2 at 17:07
Perfect thanks. Also is there a way to set a specific dimension, same for buffer?
– simone bianco
Feb 2 at 17:52
Perfect thanks. Also is there a way to set a specific dimension, same for buffer?
– simone bianco
Feb 2 at 17:52
add a comment |
1 Answer
1
active
oldest
votes
2
- No: Free memory is unused memory: you're not going out of memory at all.
- It's possible, but a bad idea: the kernel knows better than you when to use swap... ;-)
For more information on how the kernel uses memory, have a look here.
answered Feb 2 at 19:23
FabbyFabby
26.9k1360161
add a comment |
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
2
- No: Free memory is unused memory: you're not going out of memory at all.
- It's possible, but a bad idea: the kernel knows better than you when to use swap... ;-)
For more information on how the kernel uses memory, have a look here.
answered Feb 2 at 19:23
FabbyFabby
26.9k1360161
add a comment |
2
- No: Free memory is unused memory: you're not going out of memory at all.
- It's possible, but a bad idea: the kernel knows better than you when to use swap... ;-)
For more information on how the kernel uses memory, have a look here.
answered Feb 2 at 19:23
FabbyFabby
26.9k1360161
add a comment |
2
2
2
- No: Free memory is unused memory: you're not going out of memory at all.
- It's possible, but a bad idea: the kernel knows better than you when to use swap... ;-)
For more information on how the kernel uses memory, have a look here.
answered Feb 2 at 19:23
FabbyFabby
26.9k1360161
- No: Free memory is unused memory: you're not going out of memory at all.
- It's possible, but a bad idea: the kernel knows better than you when to use swap... ;-)
For more information on how the kernel uses memory, have a look here.
answered Feb 2 at 19:23
FabbyFabby
26.9k1360161
edited Feb 3 at 15:09
answered Feb 2 at 19:23
FabbyFabby
26.9k1360161
answered Feb 2 at 19:23
FabbyFabby
26.9k1360161
answered Feb 2 at 19:23
FabbyFabby
26.9k1360161
26.9k1360161
add a comment |
add a comment |
1) Could you add the graph for mem used by application too ? 2) Why do you want to reduce swap allocation ? Do you have bad performance ?
– Soren A
Feb 2 at 16:57
1) Unfortunately no 2) I want to test the performances without the swap memory
– simone bianco
Feb 2 at 17:01
As long as you have free memory swap doesn't impact performance in any way. But if you wan't, you can disable swap bu running
sudo swapoff -a– Soren A
Feb 2 at 17:07
Perfect thanks. Also is there a way to set a specific dimension, same for buffer?
– simone bianco
Feb 2 at 17:52